Finding the Fourth Proportional to 100.50, 150.81 and 42.72

Step by Step Solution

1. Step 1: Write the proportion equation
   100.50 : 150.81 = 42.72 : x
2. Step 2: Convert to fraction form
   100.50/150.81 = 42.72/x
3. Step 3: Cross multiply
   100.50x = 150.81 × 42.72
4. Step 4: Simplify right side
   100.50x = 6,442.60
5. Step 5: Solve for x
   x = 6,442.60/100.50
6. Step 6: Final answer
   x = 64.11